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https://hdl.handle.net/2440/119115
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Type: | Journal article |
Title: | Deterioration and strain energy development of sandstones under quasi-static and dynamic loading after freeze-thaw cycles |
Author: | Zhang, J. Deng, H. Taheri, A. Ke, B. Liu, C. |
Citation: | Cold Regions Science and Technology, 2019; 160:252-264 |
Publisher: | Elsevier |
Issue Date: | 2019 |
ISSN: | 0165-232X 1872-7441 |
Statement of Responsibility: | Jian Zhang, Hongwei Deng, Abbas Taheri, Bo Ke, Chuanju Liu |
Abstract: | Rocks in cold regions are often exposed to extreme temperature change, and different loading conditions, therefore, will be subjected to deterioration. In this study, the deterioration of sandstone after freeze-thaw (F-T) cycles under quasi-static and dynamic loading conditions is investigated. In doing so, physical and mechanical properties of sandstone samples were studied after 20, 60, 100 and 140 F-T cycles. An increase in porosity and decrease in P wave velocity demonstrated a degradation in physical properties after F-T cycles. In addition, peak strengths of specimens were observed to be higher in the dynamic loading conditions as compared with the quasi-static conditions; while Young's modulus almost remained constant. Furthermore, a decay model was used to predict the deterioration of sandstone under different loading conditions and F-T cycles. Finally, the effects of F-T cycles on a brittleness and strain energy development were investigated. It was observed that rock became more brittle in the pre-peak regime after F-T cycles. It also demonstrated strain energies including the pre-peak, the peak, the post-peak and the total strain energies decrease after F-T cycles while variations of elastic strain energy with F-T cycles doesn't show any conclusive trend. Correlations between porosity and strain energies implied that porosity is a key factor in strain energy development for this kind of sandstone except that of elastic strain energy. |
Keywords: | Quasi-static loading; dynamic loading; freeze-thaw cycles; sandstone; porosity; strain energy |
Rights: | © 2019 Published by Elsevier B.V. |
DOI: | 10.1016/j.coldregions.2019.01.007 |
Published version: | http://dx.doi.org/10.1016/j.coldregions.2019.01.007 |
Appears in Collections: | Aurora harvest 8 Civil and Environmental Engineering publications |
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